code: def conv1x1(in_planes, out_planes, stride=1):
      """1x1 convolution"""
      return nn.Conv2D(
          in_planes,
          out_planes,
          kernel_size=1,
          stride=stride,
          bias_attr=False,
      )
  
imports: import paddle
  import paddle.nn
  import paddle.nn.functional
  from paddleseg.cvlibs import manager, param_init
  from paddleseg.utils import utils
  from ppmatting.models.layers import GuidedCxtAtten
label_desc: Use image node_id 2 for calling a global function with example usage: conv1x1(in_planes, out_planes, stride) and returns: nn